/*
 * @brief USB Human Interface Device (HID) Class report descriptor parser
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * Copyright(C) Dean Camera, 2011, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

/** @ingroup Group_USB
 *  @defgroup Group_HIDParser HID Report Parser
 *  @brief USB Human Interface Device (HID) Class report descriptor parser.
 *
 *  @section Sec_Dependencies Module Source Dependencies
 *  The following files must be built with any user project that uses this module:
 *    - nxpUSBlib/Drivers/USB/Class/Host/HIDParser.c <i>(Makefile source module name: NXPUSBLIB_SRC_USB)</i>
 *
 *  @section Sec_ModDescription Module Description
 *  Human Interface Device (HID) class report descriptor parser. This module implements a parser than is
 *  capable of processing a complete HID report descriptor, and outputting a flat structure containing the
 *  contents of the report in an a more friendly format. The parsed data may then be further processed and used
 *  within an application to process sent and received HID reports to and from an attached HID device.
 *
 *  A HID report descriptor consists of a set of HID report items, which describe the function and layout
 *  of data exchanged between a HID device and a host, including both the physical encoding of each item
 *  (such as a button, key press or joystick axis) in the sent and received data packets - known as "reports" -
 *  as well as other information about each item such as the usages, data range, physical location and other
 *  characteristics. In this way a HID device can retain a high degree of flexibility in its capabilities, as it
 *  is not forced to comply with a given report layout or feature-set.
 *
 *  This module also contains routines for the processing of data in an actual HID report, using the parsed report
 *  descriptor data as a guide for the encoding.
 *
 *  @{
 */

#ifndef __HIDPARSER_H__
#define __HIDPARSER_H__

	/* Includes: */
		#include "../../../../Common/Common.h"

		#include "HIDReportData.h"
		#include "HIDClassCommon.h"

	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Macros: */
		#if !defined(HID_STATETABLE_STACK_DEPTH) || defined(__DOXYGEN__)
			/** Constant indicating the maximum stack depth of the state table. A larger state table
			 *  allows for more PUSH/POP report items to be nested, but consumes more memory. By default
			 *  this is set to 2 levels (allowing non-nested PUSH items) but this can be overridden by
			 *  defining \c HID_STATETABLE_STACK_DEPTH to another value in the user project makefile, passing the
			 *  define to the compiler using the -D compiler switch.
			 */
			#define HID_STATETABLE_STACK_DEPTH    2
		#endif

		#if !defined(HID_USAGE_STACK_DEPTH) || defined(__DOXYGEN__)
			/** Constant indicating the maximum stack depth of the usage table. A larger usage table
			 *  allows for more USAGE items to be indicated sequentially for REPORT COUNT entries of more than
			 *  one, but requires more stack space. By default this is set to 8 levels (allowing for a report
			 *  item with a count of 8) but this can be overridden by defining \c HID_USAGE_STACK_DEPTH to another
			 *  value in the user project makefile, passing the define to the compiler using the -D compiler
			 *  switch.
			 */
			#define HID_USAGE_STACK_DEPTH         8
		#endif

		#if !defined(HID_MAX_COLLECTIONS) || defined(__DOXYGEN__)
			/** Constant indicating the maximum number of COLLECTION items (nested or unnested) that can be
			 *  processed in the report item descriptor. A large value allows for more COLLECTION items to be
			 *  processed, but consumes more memory. By default this is set to 10 collections, but this can be
			 *  overridden by defining \c HID_MAX_COLLECTIONS to another value in the user project makefile, passing
			 *  the define to the compiler using the -D compiler switch.
			 */
			#define HID_MAX_COLLECTIONS           10
		#endif

		#if !defined(HID_MAX_REPORTITEMS) || defined(__DOXYGEN__)
			/** Constant indicating the maximum number of report items (IN, OUT or FEATURE) that can be processed
			 *  in the report item descriptor and stored in the user HID Report Info structure. A large value allows
			 *  for more report items to be stored, but consumes more memory. By default this is set to 20 items,
			 *  but this can be overridden by defining \c HID_MAX_REPORTITEMS to another value in the user project
			 *  makefile, and passing the define to the compiler using the -D compiler switch.
			 */
			#define HID_MAX_REPORTITEMS           20
		#endif

		#if !defined(HID_MAX_REPORT_IDS) || defined(__DOXYGEN__)
			/** Constant indicating the maximum number of unique report IDs that can be processed in the report item
			 *  descriptor for the report size information array in the user HID Report Info structure. A large value
			 *  allows for more report ID report sizes to be stored, but consumes more memory. By default this is set
			 *  to 10 items, but this can be overridden by defining \c HID_MAX_REPORT_IDS to another value in the user project
			 *  makefile, and passing the define to the compiler using the -D compiler switch. Note that IN, OUT and FEATURE
			 *  items sharing the same report ID consume only one size item in the array.
			 */
			#define HID_MAX_REPORT_IDS            10
		#endif

		/** Returns the value a given HID report item (once its value has been fetched via @ref USB_GetHIDReportItemInfo())
		 *  left-aligned to the given data type. This allows for signed data to be interpreted correctly, by shifting the data
		 *  leftwards until the data's sign bit is in the correct position.
		 *
		 *  @param ReportItem  HID Report Item whose retrieved value is to be aligned.
		 *  @param Type        Data type to align the HID report item's value to.
		 *
		 *  @return Left-aligned data of the given report item's pre-retrieved value for the given datatype.
		 */
		#define HID_ALIGN_DATA(ReportItem, Type) ((Type)(ReportItem->Value << ((8 * sizeof(Type)) - ReportItem->Attributes.BitSize)))

	/* Public Interface - May be used in end-application: */
		/* Enums: */
			/** Enum for the possible error codes in the return value of the @ref USB_ProcessHIDReport() function. */
			enum HID_Parse_ErrorCodes_t
			{
				HID_PARSE_Successful                  = 0, /**< Successful parse of the HID report descriptor, no error. */
				HID_PARSE_HIDStackOverflow            = 1, /**< More than @ref HID_STATETABLE_STACK_DEPTH nested PUSHes in the report. */
				HID_PARSE_HIDStackUnderflow           = 2, /**< A POP was found when the state table stack was empty. */
				HID_PARSE_InsufficientReportItems     = 3, /**< More than @ref HID_MAX_REPORTITEMS report items in the report. */
				HID_PARSE_UnexpectedEndCollection     = 4, /**< An END COLLECTION item found without matching COLLECTION item. */
				HID_PARSE_InsufficientCollectionPaths = 5, /**< More than @ref HID_MAX_COLLECTIONS collections in the report. */
				HID_PARSE_UsageListOverflow           = 6, /**< More than @ref HID_USAGE_STACK_DEPTH usages listed in a row. */
				HID_PARSE_InsufficientReportIDItems   = 7, /**< More than @ref HID_MAX_REPORT_IDS report IDs in the device. */
				HID_PARSE_NoUnfilteredReportItems     = 8, /**< All report items from the device were filtered by the filtering callback routine. */
			};

		/* Type Defines: */
			/** @brief HID Parser Report Item Min/Max Structure.
			 *
			 *  Type define for an attribute with both minimum and maximum values (e.g. Logical Min/Max).
			 */
			typedef struct
			{
				uint32_t Minimum; /**< Minimum value for the attribute. */
				uint32_t Maximum; /**< Maximum value for the attribute. */
			} HID_MinMax_t;

			/** @brief HID Parser Report Item Unit Structure.
			 *
			 *  Type define for the Unit attributes of a report item.
			 */
			typedef struct
			{
				uint32_t Type;     /**< Unit type (refer to HID specifications for details). */
				uint8_t  Exponent; /**< Unit exponent (refer to HID specifications for details). */
			} HID_Unit_t;

			/** @brief HID Parser Report Item Usage Structure.
			 *
			 *  Type define for the Usage attributes of a report item.
			 */
			typedef struct
			{
				uint16_t Page;  /**< Usage page of the report item. */
				uint16_t Usage; /**< Usage of the report item. */
			} HID_Usage_t;

			/** @brief HID Parser Report Item Collection Path Structure.
			 *
			 *  Type define for a COLLECTION object. Contains the collection attributes and a reference to the
			 *  parent collection if any.
			 */
			typedef struct HID_CollectionPath
			{
				uint8_t                    Type;   /**< Collection type (e.g. "Generic Desktop"). */
				HID_Usage_t                Usage;  /**< Collection usage. */
				struct HID_CollectionPath* Parent; /**< Reference to parent collection, or \c NULL if root collection. */
			} HID_CollectionPath_t;

			/** @brief HID Parser Report Item Attributes Structure.
			 *
			 *  Type define for all the data attributes of a report item, except flags.
			 */
			typedef struct
			{
				uint8_t      BitSize;  /**< Size in bits of the report item's data. */

				HID_Usage_t  Usage;    /**< Usage of the report item. */
				HID_Unit_t   Unit;     /**< Unit type and exponent of the report item. */
				HID_MinMax_t Logical;  /**< Logical minimum and maximum of the report item. */
				HID_MinMax_t Physical; /**< Physical minimum and maximum of the report item. */
			} HID_ReportItem_Attributes_t;

			/** @brief HID Parser Report Item Details Structure.
			 *
			 *  Type define for a report item (IN, OUT or FEATURE) layout attributes and other details.
			 */
			typedef struct
			{
				uint16_t                    BitOffset;      /**< Bit offset in the IN, OUT or FEATURE report of the item. */
				uint8_t                     ItemType;       /**< Report item type, a value in @ref HID_ReportItemTypes_t. */
				uint16_t                    ItemFlags;      /**< Item data flags, a mask of HID_IOF_* constants. */
				uint8_t                     ReportID;       /**< Report ID this item belongs to, or 0x00 if device has only one report */
				HID_CollectionPath_t*       CollectionPath; /**< Collection path of the item. */

				HID_ReportItem_Attributes_t Attributes;     /**< Report item attributes. */

				uint32_t                    Value;          /**< Current value of the report item - use @ref HID_ALIGN_DATA() when processing
				                                             *   a retrieved value so that it is aligned to a specific type.
				                                             */
				uint32_t                    PreviousValue;  /**< Previous value of the report item. */
			} HID_ReportItem_t;

			/** @brief HID Parser Report Size Structure.
			 *
			 *  Type define for a report item size information structure, to retain the size of a device's reports by ID.
			 */
			typedef struct
			{
				uint8_t  ReportID; /**< Report ID of the report within the HID interface. */
				uint16_t ReportSizeBits[3]; /**< Total number of bits in each report type for the given Report ID,
				                             *   indexed by the @ref HID_ReportItemTypes_t enum.
				                             */
			} HID_ReportSizeInfo_t;

			/** @brief HID Parser State Structure.
			 *
			 *  Type define for a complete processed HID report, including all report item data and collections.
			 */
			typedef struct
			{
				uint8_t              TotalReportItems; /**< Total number of report items stored in the \c ReportItems array. */
				HID_ReportItem_t     ReportItems[HID_MAX_REPORTITEMS]; /**< Report items array, including all IN, OUT
			                                                            *   and FEATURE items.
				                                                        */
				HID_CollectionPath_t CollectionPaths[HID_MAX_COLLECTIONS]; /**< All collection items, referenced
				                                                            *   by the report items.
				                                                            */
				uint8_t              TotalDeviceReports; /**< Number of reports within the HID interface */
				HID_ReportSizeInfo_t ReportIDSizes[HID_MAX_REPORT_IDS]; /**< Report sizes for each report in the interface */
				uint16_t             LargestReportSizeBits; /**< Largest report that the attached device will generate, in bits */
				bool                 UsingReportIDs; /**< Indicates if the device has at least one REPORT ID
				                                      *   element in its HID report descriptor.
				                                      */
			} HID_ReportInfo_t;

		/* Function Prototypes: */
			/** Function to process a given HID report returned from an attached device, and store it into a given
			 *  @ref HID_ReportInfo_t structure.
			 *
			 *  @param  ReportData  Buffer containing the device's HID report table.
			 *  @param  ReportSize  Size in bytes of the HID report table.
			 *  \param[out] ParserData  Pointer to a @ref HID_ReportInfo_t instance for the parser output.
			 *
			 *  @return A value in the @ref HID_Parse_ErrorCodes_t enum.
			 */
			uint8_t USB_ProcessHIDReport(const uint8_t* ReportData,
			                             uint16_t ReportSize,
			                             HID_ReportInfo_t* const ParserData) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);

			/** Extracts the given report item's value out of the given HID report and places it into the Value
			 *  member of the report item's @ref HID_ReportItem_t structure.
			 *
			 *  When called on a report with an item that exists in that report, this copies the report item's \c Value
			 *  to its \c PreviousValue element for easy checking to see if an item's value has changed before processing
			 *  a report. If the given item does not exist in the report, the function does not modify the report item's
			 *  data.
			 *
			 *  @param  ReportData  Buffer containing an IN or FEATURE report from an attached device.
			 *  \param[in,out] ReportItem  Pointer to the report item of interest in a @ref HID_ReportInfo_t ReportItem array.
			 *
			 *  \returns Boolean \c true if the item to retrieve was located in the given report, \c false otherwise.
			 */
			bool USB_GetHIDReportItemInfo(const uint8_t* ReportData,
			                              HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1);

			/** Retrieves the given report item's value out of the \c Value member of the report item's
			 *  @ref HID_ReportItem_t structure and places it into the correct position in the HID report
			 *  buffer. The report buffer is assumed to have the appropriate bits cleared before calling
			 *  this function (i.e., the buffer should be explicitly cleared before report values are added).
			 *
			 *  When called, this copies the report item's \c Value element to its \c PreviousValue element for easy
			 *  checking to see if an item's value has changed before sending a report.
			 *
			 *  If the device has multiple HID reports, the first byte in the report is set to the report ID of the given item.
			 *
			 *  \param[out] ReportData  Buffer holding the current OUT or FEATURE report data.
			 *  @param  ReportItem  Pointer to the report item of interest in a @ref HID_ReportInfo_t ReportItem array.
			 */
			void USB_SetHIDReportItemInfo(uint8_t* ReportData,
			                              HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1);

			/** Retrieves the size of a given HID report in bytes from its Report ID.
			 *
			 *  @param ParserData  Pointer to a @ref HID_ReportInfo_t instance containing the parser output.
			 *  @param ReportID    Report ID of the report whose size is to be determined.
			 *  @param ReportType  Type of the report whose size is to be determined, a value from the
			 *                         @ref HID_ReportItemTypes_t enum.
			 *
			 *  @return Size of the report in bytes, or \c 0 if the report does not exist.
			 */
			uint16_t USB_GetHIDReportSize(HID_ReportInfo_t* const ParserData,
			                              const uint8_t ReportID,
			                              const uint8_t ReportType) ATTR_CONST ATTR_NON_NULL_PTR_ARG(1);

			/** Callback routine for the HID Report Parser. This callback <b>must</b> be implemented by the user code when
			 *  the parser is used, to determine what report IN, OUT and FEATURE item's information is stored into the user
			 *  @ref HID_ReportInfo_t structure. This can be used to filter only those items the application will be using, so that
			 *  no RAM is wasted storing the attributes for report items which will never be referenced by the application.
			 *
			 *  Report item pointers passed to this callback function may be cached by the user application for later use
			 *  when processing report items. This provides faster report processing in the user application than would
			 *  a search of the entire parsed report item table for each received or sent report.
			 *
			 *  @param CurrentItem  Pointer to the current report item for user checking.
			 *
			 *  @return Boolean \c true if the item should be stored into the @ref HID_ReportInfo_t structure, \c false if
			 *          it should be ignored.
			 */
			bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_t* const CurrentItem);

	/* Private Interface - For use in library only: */
	#if !defined(__DOXYGEN__)
		/* Type Defines: */
			typedef struct
			{
				 HID_ReportItem_Attributes_t Attributes;
				 uint8_t                     ReportCount;
				 uint8_t                     ReportID;
			} HID_StateTable_t;
	#endif

	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif

#endif

/** @} */

